Attributes . The Fi2000R O2 digital fuel processor is designed to work with exhaust systems (stock or aftermarket) equipped with oxygen sensors in place (closed-loop design). Works much like a carburetor jet kit with adjustments similar to the air-mixture screw, the needle and clip positions and the main jet. The Fi2000R increases horsepower and torque by optimizing stock lean air/fuel mixtures (helps cool the engine temps as well). Quick and simple installation with plug-and-ride technology with OEM-style connectors. No confusing computer downloads to install. No expensive dyno-testing required. Pre-configured from the factory for your make and model, but easy to adjust should your specific application need it. Improves overall rideability. Virtually eliminates backfiring on deceleration. MANUFACTURERS NOTE . Values